Auto Refinance Break-Even Method, Formula & Examples
On this page
This method guide explains the calculation sequence behind the Auto Refinance Break-Even Calculator. It owns formulas, input definitions, timing, rounding and reference checks; the calculator remains the only page that performs the numeric scenario.
Calculation sequence
Both loans use standard monthly amortization. Total remaining cash outflow includes scheduled payments and cash fees; financed fees increase replacement principal. Cash-fee break-even is shown only when monthly payment falls.
Inputs and evidence
Use current written documents for every material input. The calculator supports: Market and currency, Current payoff amount, Current annual rate, Current remaining months, Proposed annual rate, Proposed term months, Cash refinance fees, Fees added to new principal.
Reference example
If both zero-rate loans keep the same 24,000 balance and 48-month term, each payment is 500. Adding a 480 cash fee makes refinancing 480 more expensive.
Boundary and error checks
Test zero-rate branches where available, minimum and maximum supported inputs, and a scenario in which the main result reverses. Reject blank, non-finite or out-of-range values rather than silently substituting them.
Model boundary
The model excludes simple-interest daily accrual timing, lender-specific payoff dates, refunds, add-on cancellation, taxes, title fees, late charges, variable rates and credit approval.
Sources and review status
- CFPB — Take control of your auto loan
- FTC — Financing or leasing a car
- Financial Consumer Agency of Canada — Financing a car
Sources and model boundaries checked 2026-10-08. This new opportunity-map expansion has automated formula, fixture and source QA but has not been represented as human editorial review. Keep the route noindex until CalculatorGeek records a completed YMYL editorial review.